g-raham



- 38heets-Sheet 1. G. H. GRAHAM; MACHINE FOR THREADING BOLTS.

(No' Model.)

Patented Apr. 18, 1882.

3 sheets-sheet 2.

(No Model.

0. H. GRAHAM. MACHINE FOR THREADING BOLTS.

Patented A rfls, 1882.

(No Model.) a Sheets-Sheet 3.,

G.H.GRAHAM." 8 MACHINE FORTH'READING BOLTS. 8 No. 256,675. 8 PatentedApr. 18,1882.

I A" -L UNITED STATES PATENT ()FFI- E.

CHARLES H. GRAHAM, OF UNIONVILLE, CONNECTICUT, ASSIGNOR TO THE UNION NUTCOMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 256,675, dated April18, 1882.

Application filed May 2, 18 81. No model.)

To all whom it may concern.-

Be it known that LOHARLns H. GRAHAM, of Unionville, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Machines for Threading Bolts, of which the following-isa specification.

My invention relates to improvements in bolt-threading machines in whichthe threading-dies are opened and closed by a reciprocating longitudinalmotion of the spindle or main shaft and the bolts are fed from a hopperto the dies,;all operating automatically, so that the bolts are nottouched by hand, after placing them in the hopper, until after they arethreaded and fall from the holding-jaws.

The objects of my improvements are to render the machine automatic andto so simplify its construction that itis very compact in form, sure inits operation, and economical to build. I attain these objects by themechanism illus trated in the accompanying drawings, in

' which Figure 1 is a plan view minus the feeding mechanism. Fig. 2 is aside elevation complete. Fig. 3 is a longitudinal section of a portionof the main shaft and the head which carries the dies. Fig. 4 is an endview of said head. Fig. 5 is a transverse section on'line x 00 of Fig.2. Fig. 6 is a longitudinal partial section on line 51 y of Fig. 5, andFig. 7 is':-'an end view. J V

A designates the main shaft bearing the head 13, which carries thethreading cutters or dies, mounted on hinged jaws b; This'shaft isreciprocated longitudinally by means hereinafter described, for thepurpose of opening and closing the jaws and to allow it to run forwardin cutting the thread and return. It is hollow andcarries within it arod, 0, Fig. 3, to which rod is pinned the collar d and cone 6,

the shaft b'eing longitudinally slotted for a t I\ i i I short distanceat the points through which the collar-pins pass, so that the rod,together with the collar and cone, has a slight longitudinal movementrelatively to the shaft. These parts, however, are not new with me,exceptin combination with the other parts. V

In order that the shaft A may be properly started forward and backward,I secure rigidly to said shaft a grooved collar, f, and connect theretoasliding frame, g, one arm of which frame extends upward and bears afork and divided ring, which rests in the groove of the collar f,and'the other arm' of which extends toward the rear of the machine.

At the rear side of the machine, and extend- 'ing nearly the wholelength of the bed, there is a shaft which is parallel to the main shaft,I and which I designate as the parallelcam- 6o shaft, C. This shaft C isconnected with the main shaft A, by means of a system of geared wheels,D D, so as to rotate positivelyat'a given relative speed, but muchslower-#for example, one revolution to every twenty of the main shaft.

Apair of sideaeting cams, h h, are set face to face on the parallelcam-shaft C, and the end of the rearwardly-extending arm'of the slidingframe g lies between said cams, as shown in Fig. 1. Suppose'anunthreaded bolt to be firmly held in proper position before thecutting-dies of the head B at a time when the cam h has forced theslidingframe g andjsliaft A backward so far as the highest point offsaidcam will carry them. In doing so the back of the cone 6 strikes theframe E and arrests'thc backward movement of the cone 6 and the rod 0,while the movement of the shaft stillcontinues until the tails ofthejaws are drawn So over the cone and the jaws closed ready for"cutting. The cam 71. next strikes. the arm of the sliding frame 9 andthrows the shaftforward. This forward movement of the shaft issufficient to force the dies against theend of the bolt and enter ittherein, after which the thread in the dies will draw the shaft forward.

I prefer to make the 'side of the cam h to yield under the influence ofa spring; but it may be made rigid, if desired. go

The thread in the dies continues to draw the shaft forward until thecollar d strikes the adjusting-screws t 2', Fig. 3, or other suitablestops on the frame E of the machine. This will arrest the forwardmovement of the collar, rod, 5 and cone while the shaft continuesonward, thereby carrying the tails of the jaws off the base of-the coneand allowing the springsj,

Fig. 3, to throw open the jaws. The cam h then takes the shaft backwardto its former position, and the operation before described is repeated.Only one of the jaws is shown in Fig. 3, and only three in Fig. 5; butin use of the particular form of head shown in Fig. 4 there will alwaysbe fourjaws in the head. If desired, the head might be made forthreejaws set at equidistant points.

I mount a hopper or pan, F, upon the frame of the machine and give it acontinuous but slow rotary motion by means of beveled gears k and a beltor pulley, land 12:, the latter being on the shaft 0, and the wholederiving their motion from that shaft.

A swinging trough or take-up, Gr, having a claw-shaped end, is mountedupon an inclined trough, H, so as to swing from the position in which itis represented in Figs. 2 and 7 to one in which its claw-shaped end isin the inside and near the bottom of the pan. This motion is caused bythe rising and falling of the spindle n and arm 0, Fig. 2, under theinfluence of a cam, (not shown,) which cam is operated by the pulley Z.The motion of the take-up G, together with the rotary motion of the panF,will supply the trough H with bolts from said pan.

The bolts are prevented from falling through the trough H- by means of aswinging arm, g, on the rock-shaftp. Upon the parallel camshaft 0 is acam, I, which acts upon the end of the lever J, and through pitman rimpart-s motion to the hollow rock-shaft K, a sectional view of which isshown in Fig. 6. A pitman, 8, connected to suitable arms on the hollowrock-shaft K and the rock-shaft p, imparts motion from the former shaftto the latter one, wherebythe arm q will swing out from under the troughand carry the bottom bolt with it. When it is thus carried forward thespringjaws mounted on the swinging arm L of the rock-shaft M are causedto descend and seize the'bolt. This rock-shaft M is mounted upon theinside ofthe hollow rock-shaft K, as clearly shown in Fig. 6, and it hasmotion imparted to itby means of the cam N on parallel camshaft O, lever0, and pitman t. Springs upon the pitmen r and tforce the rocking armsin one direction, while the cams I N force them in the oppositedirection. The cam N should be so shaped as to cause the swinging arm Lto descend and take hold of the bolt lying on the arm q, retreat out ofthe way, and then further descend to carry the bolt to the holding-jawsP P, when the jaws close upon the bolt and the arm L and its spring-jawsrise again to their former position, leaving the bolt firmly held inthejaws P P. These jaws are forced together by means of the cam R oncamshaft G, lever S, and wedge a. The several cams are so located uponthe parallel camshaft that the several operations will take place in therespective times hereinbefore de scribed.

If the bolts are lifted into the trough faster than they are taken outat the bottom, they will fall upon the trough and roll off without doingany damage, and if the trough is not supplied as fast as they can betaken out by the rocking arm q the only effect will be that every time abolt is missed the parts will make their usual movement withoutaccomplishing anything.

The rotary pan F, swinging take-up G, trough H, swinging arm q, andswinging arm L, carrying spring-jaws, are old in prior combinations, andare claimed by me only in combination with the other parts of themachine.

By the employment of the parallelcam-shaft the machine is of a verycompact form, and only one cam-shaft is necessary for the whole machine.The shaft is also driven by simple gearing, so that the relative motionsof the cam-shaft and main shaft are positive, and the completeorganization is such that the machine is automatic by merely supplyingthe pan with bolts promiscuously placed therein, and one person can keepthe pans of several machines supplied.

I claim as my invention- 1. The combination of the main shaft bearingthreading-dies and mechanism for opening and closing said dies by alongitudinal reciprocation of said shaft, the parallel cam-shaft,intermediate connecting-gearing, and cams h h,, operating upon anextension from the main shaft to reciprocate it, substantially asdescribed, and for the purpose specified.

2. In combination with the mainshaftA,provided with the central rod, 0,and hingedjaws b, carrying the dies, the cone 0, collar d,adjusting-screws it, collarf, sliding frame g, and pair of side cams, hh, substantially as described, and for the purpose specified.

3. In a bolt-threading machine, the combination of the main shaft andthreading-dies, the holding-jaws P P, wedge a, lever S, and cam It,substantially as described, and for the purpose specified.

4. In a boltthreading machine, the combination of the main shaft andthreading-dies, the holding-jaws P P, wedge u, lever S, cam It, and theautomatic feed mechanism for feedin g the bolts from the pan or hopperthrough a trough to the holding-jaws, substantially as described, andfor the purpose specified.

5. The combination of the main shaft bearing threading-dies andmechanism for opening and closing said dies by a longitudinalreciprocation of said shaft, the parallel cam-shaft, intermediateconnecting-gearing, cams h, h, and R, lever S, wedge u, and jaws P P,substantially as described, and for the purpose specified.

6. In a bolt-threading machine, the combination of the main shaft andthreading-dies, the holding-jaws P P, wedge u, lever S, cam

' R, rock-shafts p and M, and cams N and I, for

operating said rock-shafts, substantially as described, and for thepurpose specified.

7. The combination of the main shaft bear- IIO ing threading-dies andmechanism for opening wedge u, jaws P P, and the automatic feed "andclosing said dies by a longitudinal recipmechanism, substantially asdescribedgmd for IO rocation of said shaft, intermediate connecti thepurpose specified. ing-gearing, cams h, h and R, lever S, wedge 5 u,jaws P P, and the Automatic feed mechan- CHAS A ism, substantially asdescribed, and for the Witnesses: purpose specified. W. A. HITCHGOCK,

8. The combination of the cam B, lever S, GEO. B. PLACE.

